/*
 * QEMU WAV audio driver
 *
 * Copyright (c) 2007 The Android Open Source Project
 * Copyright (c) 2004-2005 Vassili Karpov (malc)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "hw/hw.h"
#include "qemu/timer.h"
#include "audio.h"

#define AUDIO_CAP "wav"
#include "audio_int.h"

#define  WAV_AUDIO_IN  1

/** VOICE OUT  (Saving to a .WAV file)
 **/
typedef struct WAVVoiceOut {
    HWVoiceOut hw;
    FILE *f;
    int64_t old_ticks;
    void *pcm_buf;
    int total_samples;
} WAVVoiceOut;

static struct {
    struct audsettings settings;
    const char *wav_path;
} conf_out = {
    {
        44100,
        2,
        AUD_FMT_S16,
        0
    },
    "qemu.wav"
};

static int wav_out_run (HWVoiceOut *hw, int live)
{
    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
    int rpos, decr, samples;
    uint8_t *dst;
    struct st_sample *src;
    int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
    int64_t ticks = now - wav->old_ticks;
    int64_t bytes =
        muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());

    if (bytes > INT_MAX) {
        samples = INT_MAX >> hw->info.shift;
    }
    else {
        samples = bytes >> hw->info.shift;
    }

    wav->old_ticks = now;
    decr = audio_MIN (live, samples);
    samples = decr;
    rpos = hw->rpos;
    while (samples) {
        int left_till_end_samples = hw->samples - rpos;
        int convert_samples = audio_MIN (samples, left_till_end_samples);

        src = hw->mix_buf + rpos;
        dst = advance (wav->pcm_buf, rpos << hw->info.shift);

        hw->clip (dst, src, convert_samples);
        if (fwrite (dst, convert_samples << hw->info.shift, 1, wav->f) != 1) {
            dolog ("wav_run_out: fwrite of %d bytes failed\nReaons: %s\n",
                   convert_samples << hw->info.shift, strerror (errno));
        }

        rpos = (rpos + convert_samples) % hw->samples;
        samples -= convert_samples;
        wav->total_samples += convert_samples;
    }

    hw->rpos = rpos;
    return decr;
}

static int wav_out_write (SWVoiceOut *sw, void *buf, int len)
{
    return audio_pcm_sw_write (sw, buf, len);
}

/* VICE code: Store number as little endian. */
static void le_store (uint8_t *buf, uint32_t val, int len)
{
    int i;
    for (i = 0; i < len; i++) {
        buf[i] = (uint8_t) (val & 0xff);
        val >>= 8;
    }
}

static int wav_out_init (HWVoiceOut *hw, struct audsettings *as)
{
    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
    int bits16 = 0, stereo = 0;
    uint8_t hdr[] = {
        0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
        0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
        0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
        0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
    };
    struct audsettings wav_as = conf_out.settings;

    (void) as;

    stereo = wav_as.nchannels == 2;
    switch (wav_as.fmt) {
    case AUD_FMT_S8:
    case AUD_FMT_U8:
        bits16 = 0;
        break;

    case AUD_FMT_S16:
    case AUD_FMT_U16:
        bits16 = 1;
        break;

    case AUD_FMT_S32:
    case AUD_FMT_U32:
        dolog ("WAVE files can not handle 32bit formats\n");
        return -1;
    }

    hdr[34] = bits16 ? 0x10 : 0x08;

    wav_as.endianness = 0;
    audio_pcm_init_info (&hw->info, &wav_as);

    hw->samples = 1024;
    wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
    if (!wav->pcm_buf) {
        dolog ("Could not allocate buffer (%d bytes)\n",
               hw->samples << hw->info.shift);
        return -1;
    }

    le_store (hdr + 22, hw->info.nchannels, 2);
    le_store (hdr + 24, hw->info.freq, 4);
    le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
    le_store (hdr + 32, 1 << (bits16 + stereo), 2);

    wav->f = fopen (conf_out.wav_path, "wb");
    if (!wav->f) {
        dolog ("Failed to open wave file `%s'\nReason: %s\n",
               conf_out.wav_path, strerror (errno));
        g_free (wav->pcm_buf);
        wav->pcm_buf = NULL;
        return -1;
    }

    if (fwrite (hdr, sizeof (hdr), 1, wav->f) != 1) {
        dolog ("wav_init_out: failed to write header\nReason: %s\n",
               strerror(errno));
        return -1;
    }
    return 0;
}

static void wav_out_fini (HWVoiceOut *hw)
{
    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
    uint8_t rlen[4];
    uint8_t dlen[4];
    uint32_t datalen = wav->total_samples << hw->info.shift;
    uint32_t rifflen = datalen + 36;

    if (!wav->f) {
        return;
    }

    le_store (rlen, rifflen, 4);
    le_store (dlen, datalen, 4);

    fseek (wav->f, 4, SEEK_SET);
    fwrite(rlen, 4, 1, wav->f);

    fseek (wav->f, 32, SEEK_CUR);
    fwrite(dlen, 4, 1, wav->f);

    fclose (wav->f);
    wav->f = NULL;

    g_free (wav->pcm_buf);
    wav->pcm_buf = NULL;
}

static int wav_out_ctl (HWVoiceOut *hw, int cmd, ...)
{
    (void) hw;
    (void) cmd;
    return 0;
}


#if WAV_AUDIO_IN

/** WAV IN (Reading from a .WAV file)
 **/

 static struct {
    const char *wav_path;
} conf_in = {
    "qemu.wav"
};

typedef struct WAVVoiceIn {
    HWVoiceIn  hw;
    FILE*      f;
    int64_t    old_ticks;
    void*      pcm_buf;
    int        total_samples;
    int        total_size;
} WAVVoiceIn;


static int
le_read( const uint8_t*  p, int  size ) {
    int  shift  = 0;
    int  result = 0;
    for ( ; size > 0; size-- ) {
        result = result | (p[0] << shift);
        p     += 1;
        shift += 8;
    }
    return  result;
}

static int
wav_in_init (HWVoiceIn *hw, struct audsettings *as)
{
    WAVVoiceIn*  wav = (WAVVoiceIn *) hw;
    const char*  path = conf_in.wav_path;
    uint8_t      hdr[44];
    struct audsettings wav_as = *as;
    int           nchannels, freq, format, bits;

    wav->f = fopen (path, "rb");
    if (wav->f == NULL) {
        dolog("Failed to open wave file '%s'\nReason: %s\n", path,
              strerror(errno));
        return -1;
    }

    if (fread(hdr, sizeof(hdr), 1, wav->f) != 1) {
        dolog("File '%s' doesn't seem to be a .wav file\n", path);
        goto Fail;
    }

    /* check that this is a wave file */
    if ( hdr[0] != 'R' || hdr[1] != 'I' || hdr[2] != 'F' || hdr[3] != 'F' ||
         hdr[8] != 'W' || hdr[9] != 'A' || hdr[10]!= 'V' || hdr[11]!= 'E' ||
         hdr[12]!= 'f' || hdr[13]!= 'm' || hdr[14]!= 't' || hdr[15]!= ' ' ||
         hdr[40]!= 'd' || hdr[41]!= 'a' || hdr[42]!= 't' || hdr[43]!= 'a') {
         dolog("File '%s' is not a valid .wav file\n", path);
         goto Fail;
    }

    nchannels   = le_read( hdr+22, 2 );
    freq        = le_read( hdr+24, 4 );
    format      = le_read( hdr+32, 2 );
    bits        = le_read( hdr+34, 2 );

    wav->total_size = le_read( hdr+40, 4 );

    /* perform some sainty checks */
    switch (nchannels) {
        case 1:
        case 2: break;
        default:
            dolog("unsupported number of channels (%d) in '%s'\n",
                  nchannels, path);
            goto Fail;
    }

    switch (format) {
        case 1:
        case 2:
        case 4: break;
        default:
            dolog("unsupported bytes per sample (%d) in '%s'\n",
                  format, path);
            goto Fail;
    }

    if (format*8/nchannels != bits) {
        dolog("invalid bits per sample (%d, expected %d) in '%s'\n",
              bits, format*8/nchannels, path);
        goto Fail;
    }

    wav_as.nchannels  = nchannels;
    wav_as.fmt        = (bits == 8) ? AUD_FMT_U8 : AUD_FMT_S16;
    wav_as.freq       = freq;
    wav_as.endianness = 0;  /* always little endian */

    audio_pcm_init_info (&hw->info, &wav_as);

    hw->samples  = 1024;
    wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
    if (!wav->pcm_buf) {
        goto Fail;
    }
    return 0;

Fail:
    fclose (wav->f);
    wav->f = NULL;
    return -1;
}


static void wav_in_fini (HWVoiceIn *hw)
{
    WAVVoiceIn *wav = (WAVVoiceIn *) hw;

    if (!wav->f) {
        return;
    }

    fclose (wav->f);
    wav->f = NULL;

    g_free (wav->pcm_buf);
    wav->pcm_buf = NULL;
}

static int wav_in_run (HWVoiceIn *hw)
{
    WAVVoiceIn*   wav = (WAVVoiceIn *) hw;
    int           wpos, live, decr, samples;
    uint8_t*      src;
    struct st_sample*  dst;

    int64_t  now   = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
    int64_t  ticks = now - wav->old_ticks;
    int64_t  bytes = muldiv64(ticks, hw->info.bytes_per_second, get_ticks_per_sec());

    if (bytes > INT_MAX) {
        samples = INT_MAX >> hw->info.shift;
    }
    else {
        samples = bytes >> hw->info.shift;
    }

    live = audio_pcm_hw_get_live_in (hw);
    if (!live) {
        return 0;
    }

    wav->old_ticks = now;

    decr    = audio_MIN (live, samples);
    samples = decr;
    wpos    = hw->wpos;
    while (samples) {
        int left_till_end_samples = hw->samples - wpos;
        int convert_samples       = audio_MIN (samples, left_till_end_samples);

        dst = hw->conv_buf + wpos;
        src = advance (wav->pcm_buf, wpos << hw->info.shift);

        clearerr(wav->f);
        size_t read_bytes = fread(src, 1, convert_samples << hw->info.shift, wav->f);
        if (read_bytes == 0 && ferror(wav->f) != EINTR)
            return 0;

        size_t read_samples = read_bytes >> hw->info.shift;
        memcpy (dst, src, read_bytes);

        wpos                = (wpos + read_samples) % hw->samples;
        samples            -= read_samples;
        wav->total_samples += read_samples;
    }

    hw->wpos = wpos;
    return decr;
}

static int wav_in_read (SWVoiceIn *sw, void *buf, int len)
{
    return audio_pcm_sw_read (sw, buf, len);
}

static int wav_in_ctl (HWVoiceIn *hw, int cmd, ...)
{
    (void) hw;
    (void) cmd;
    return 0;
}

#endif  /* WAV_AUDIO_IN */

/** COMMON CODE
 **/
static void *wav_audio_init (void)
{
    return &conf_out;
}

static void wav_audio_fini (void *opaque)
{
    (void) opaque;
    ldebug ("wav_fini");
}

static struct audio_option wav_options[] = {
    {"FREQUENCY", AUD_OPT_INT, &conf_out.settings.freq,
     "Frequency", NULL, 0},

    {"FORMAT", AUD_OPT_FMT, &conf_out.settings.fmt,
     "Format", NULL, 0},

    {"DAC_FIXED_CHANNELS", AUD_OPT_INT, &conf_out.settings.nchannels,
     "Number of channels (1 - mono, 2 - stereo)", NULL, 0},

    {"PATH", AUD_OPT_STR, &conf_out.wav_path,
     "Path to output .wav file", NULL, 0},

#if WAV_AUDIO_IN
    {"IN_PATH", AUD_OPT_STR, &conf_in.wav_path,
     "Path to input .wav file", NULL, 0},
#endif
    {NULL, 0, NULL, NULL, NULL, 0}
};

struct audio_pcm_ops wav_pcm_ops = {
    wav_out_init,
    wav_out_fini,
    wav_out_run,
    wav_out_write,
    wav_out_ctl,

#if WAV_AUDIO_IN
    wav_in_init,
    wav_in_fini,
    wav_in_run,
    wav_in_read,
    wav_in_ctl
#else
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
#endif
};

struct audio_driver wav_audio_driver = {
    INIT_FIELD (name           = ) "wav",
    INIT_FIELD (descr          = )
    "WAV file read/write (www.wikipedia.org/wiki/WAV)",
    INIT_FIELD (options        = ) wav_options,
    INIT_FIELD (init           = ) wav_audio_init,
    INIT_FIELD (fini           = ) wav_audio_fini,
    INIT_FIELD (pcm_ops        = ) &wav_pcm_ops,
    INIT_FIELD (can_be_default = ) 0,
#if WAV_AUDIO_IN
    INIT_FIELD (max_voices_in  = ) 1,
    INIT_FIELD (max_voices_out = ) 1,
    INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
    INIT_FIELD (voice_size_in  = ) sizeof (WAVVoiceIn)
#else
    INIT_FIELD (max_voices_out = ) 1,
    INIT_FIELD (max_voices_in  = ) 0,
    INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
    INIT_FIELD (voice_size_in  = ) 0
#endif
};